EP 2030488 A2 20090304 - LAMP DRIVING CIRCUIT
Title (en)
LAMP DRIVING CIRCUIT
Title (de)
LAMPENANSTEUERSCHALTUNG
Title (fr)
CIRCUIT D'ATTAQUE POUR LAMPE
Publication
Application
Priority
- IB 2007052028 W 20070530
- EP 06114768 A 20060531
- EP 07736047 A 20070530
Abstract (en)
[origin: WO2007138553A2] In a lamp driving circuit for operating a high intensity discharge lamp, an a commutation circuit comprises at least two switching devices. The switching devices are alternately switched active at a commutation frequency. The active switching device switches at a switching frequency. During an ignition mode, the switching frequency and the commutation frequency are substantially equal. A resulting commutation voltage is supplied to an inverter resonant circuit for generating a supply current. At a node of the inverter resonant circuit, a clamping circuit limits the generated voltage to a predetermined maximum voltage. The voltage at said node of the inverter resonant circuit is applied to an output resonant circuit. The output resonant circuit operates in the ignition mode as a resonator for generating a high ignition voltage; in a steady state operation mode, the output resonant circuit operates as a low-pass filter for reducing a high frequency current component in a lamp current.
IPC 8 full level
H05B 41/288 (2006.01); H05B 41/282 (2006.01)
CPC (source: EP KR US)
H05B 41/24 (2013.01 - KR); H05B 41/282 (2013.01 - KR); H05B 41/288 (2013.01 - KR); H05B 41/2881 (2013.01 - EP US); Y02B 20/00 (2013.01 - EP US)
Citation (search report)
See references of WO 2007138553A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007138553 A2 20071206; WO 2007138553 A3 20080522; CN 101461289 A 20090617; CN 101461290 A 20090617; CN 101461290 B 20160120; EP 2030488 A2 20090304; JP 2009539221 A 20091112; JP 5595728 B2 20140924; KR 20090018846 A 20090223; US 2009115341 A1 20090507; US 8227997 B2 20120724
DOCDB simple family (application)
IB 2007052028 W 20070530; CN 200780020169 A 20070510; CN 200780020226 A 20070530; EP 07736047 A 20070530; JP 2009512746 A 20070530; KR 20087031874 A 20081229; US 30203407 A 20070530